Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Matching of sand fleas to their own and different beaches for (a) colour and (b) luminance, with regards to potential avian predators. Camouflage is measured in ‘just noticeable differences' (JNDs), with values less than 1–3 indicating effective camouflage and higher values equating to decreasing matches. Numbers refer to the specific beach.
